Composite cylinder for internal combustion engines



J. SCHUBERT Feb. 21, 1933.

COMPOSITE CYLINDER F( )R INTERNAL COMBUSTION ENGINES Original Filed March 22, 1930 II r I v gwuwntow Julius flak/uteri Patented Feb. 21 1933 PATENT OFFICE JULIUS SCHUBEBT, OF LYNDHURST, NEW JERSEY COMPOSITE CYLINDER FOB INTERNAL COMBUSTION ENGINES Original-application filed larch 22, 1880, Serial No. 438,209. Divided and this application filed March 7,

1931. Serial N0. 520,965.

This invention relates to internal combus-.

tion engines and, among other objects, aims to provide an improved stepped cyllnder assembly constituting a power cylinder portion and a pumping cylinder portion adapted to accommodate a stepped piston and to be secured as a unit to the crank case of an engine. The main idea is to provide a relatively simple and light cylinder assembly 1 that can be easily and cheaply manufactured and having provision to enable it to withstand ordinary differences in expansion of the parts without cracking.

Other aims and advantages of the invention will appear in the specification when considered in the connection with the accompanying drawing, wherein Fig. 1 is a central sectional view of a cylinder assembly embodying the invention;

Fig. 2 is a side elevation taken at right angles to Fig. 1;

Fig. 3 is a sectional view taken on the line 3-3 of Fig. l; and

Fig. 4 is a top plan view.

This application is a division of my application Ser. No. 438,209 filed March 22, 1930, disclosing a series of radial cylinders in a two-cycle motor. However, it is to be understood that the same type of cylinder may be employed in Diesel engines embodying substantially the same design. In said application, the cylinders are shown as being composed of separate parts or sections made of difi'erent metals in order to provide for proper heat dissipation and to permit relative expansion and contraction of the stepped portions without subjecting them to cracking strains.

Referring particularly to the illustrated embodiment, the composite cylinder is shown as comprising a power cylinder portion 10 conveniently made of cast iron or steel and having heat radiating fins 11. This power cylinder preferably has a relatively thin cylindrical extension 12 telescoped within a ste ped cylinder jacket 13 which is prefera ly composed of aluminum alley or any suitable metal having a relative high coefiicient of heat conductivity. The extension 12 projects through the small upper or cast iron and shrunk into the cylindrical enouter end of the stepped jacket 13 and the two parts are shown as having registering intake and exhaust ports 14 and 15, respectively. The lower end of the stepped cylinder jacket 13 is enlarged to provide a pump cy1 inder portion lG adpted to be bolted or otherwise secured to a crank case.

Referring to Fig. 1, thereis shown 9. cylindrical sleeve 17 preferably made of steel or largement or pump cylinder jacket 16. This sleeve is preferably provided with an external annular flange or rib 18 secured in a groove 19 around the lower end of the jacket 16. The inner end of the sleeve, which constitutes the pump cylinder, projects inwardly beyond the inner end of the jacket '16 and is adapted to extend into the crank case of the engine. It is shown as having a series of intake ports 20 near its inner end adapted to be uncovered by the stepped enlargement of a composite piston (not shown). The cylinder jacket 16 and the upper end of the sleeve 17 are shown as having registering outlet ports 21. v

A separate cylinder head 22, preferably having radiating fins 23, issecured to the power cylinder 10. Referring to Figs. 2, 3 and 4, the parts 13, 10 and 22 are shown as being secured together b means of a'series of stud bolts 24 passing through openings in the cylinder head 22 and having threaded inner ends extending into bosses 25 on the steppedcylinder jacket 13. The parts are clamped together by means of'ordinary nuts 26 accessible at the outer end of the cylinder. It is only necessar to remove the nuts in order. to remove t e cylinder head or the power cylinder or both, thereby affording access to the outer end of the power piston so as to replace rings when necessary.

From the foregoing description, it will be seen that the improved composite cylinder, can be manufactured very cheaply. The parts subject to wear are made of Wear-resisting metal; while other arts are made of cast metalhaving a relative y high co-efficient of heat conductivity. Furthermore, the separate sections enable the power cylinder and head to be removed without necessitating removal of the entire unit from the crank case.

Moreover, a work section or part can be removed and replaced at a relatively low cost.

Ubviously, the present invention is not restricted to the particular embodiment thereof herein shown and described. Moreover, it is not indispensable that all the features of the invention be used conjointly, since they may cylinder; a pump cylinder sleeve mounted in the large end of the jacket; an annular flange on said sleeve; and a "roove in the end of the acket to receive the ii ange.

In testimony,.that I claim the foregoing as my own, I have hereto a-i'iixed my signature.

JULIUS SCH UBERT.

be employed advantageously in various comtion; and means removably to secure the workin cylinder and head to said stepped cylindrical jacket.

2. A composite, stepped cylinder assembly for internal combustion engines comprising, in combination, a power cylinder section; a stepped cylindrical jacket; an extension on the power cylinder section telescoped within the stepped cylindrical jacket; a cylindrical sleeve in the enlarged portion of the stepped cylindrical jacket constituting a pump cylinderand a head rcmovably secured to the working cylinder.

3. A composite, stepped cylinder for internal combustion engines comprising, in combination, a stepped cylindrical jacket adapted to be secured to a crankcase; a power cylinder having a portion telescoped in one end of the jacket; and a separate pump cylinder telescoped in and projecting beyond the other end of said jacket.

4. A composite, stepped cylinder for internal combustion engines comprising, in combination, a stepped cylindrical jacket composed of an alloy and adapted to be secured to a crankcase; a power cylinder having an extension telescoped in the small end of said stepped jacket; and a thin cylindrical sleeve of wear-resisting metal constituting a pump cylinder shrunk into the large end of the stepped jacket and adapted to project into the crankcase.

5. In a composite, stepped cylinder, a power cylinder section having heat-radiating fins; a thin, pump cylinder section of larger diameter extending inwardly from the power cylinder section; and a stepped cylindrical jacket to which both of said sections are secured, so as to permit relative expansion and contraction of the sections independently of said jacket.

6. A composite, stepped cylinder for internal combustion engines comprising a ower cylinder section; a stepped cylindrical acket telescoped over the inner end of the working 

